package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.util.HashMap;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        //校验手机号
        if (RegexUtils.isPhoneInvalid(phone)) {
            //无效返回
            return Result.fail("手机号无效，请重新输入");
        }
        //有效，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //保存到redis里面,用手机号作为key，并设置超时时间
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY + phone, code, LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //发送验证码
        log.debug("发送成功，验证码：{}", code);
        //返回成功结果
        return Result.ok();
    }

    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //手机号的校验
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)) {
            //不一致，返回
            return Result.fail("手机号无效");
        }
        //从redis里获取验证码进行校验
        String redisCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);
        //Object cacheCode = session.getAttribute("code");
        String code = loginForm.getCode();//用户输入的验证码
        if (redisCode == null || !redisCode.equals(code)) {
            //不一致返回
            return Result.fail("验证码错误");
        }
        //查询用户
        User user = query().eq("phone", phone).one();
        //不存在，注册一个新用户
        if (user == null) {
            user = createUserWithPhone(phone);
        }
        //存在
        /* 保存到redis中*/
        //随机生成token作为登录令牌
        String token = UUID.randomUUID().toString();
        //将用户转换为hashMap存储
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(),
                CopyOptions.create()
                        .setIgnoreNullValue(true)
                        .setFieldValueEditor((fieldName, fieldValue) -> fieldValue.toString()));
        //存储
        String tokenKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokenKey, userMap);
        //设置token有效期限
        stringRedisTemplate.expire(tokenKey, LOGIN_USER_TTL, TimeUnit.MINUTES);
        return Result.ok(token);
    }

    private User createUserWithPhone(String phone) {

        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX + RandomUtil.randomString(6));
        //保存到数据库
        save(user);
        return user;
    }
}
